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E, DanielI don't agree Paul, It's not necessary for it to 'stick', it merely has to not "run-off" so completely as to appear that no ink ever landed in that spot.
In fact, I can't fathom how some ink could NOT lie, seep, and dry over the red ink and leave a grayed out effect in that spot. It's not as if the red ink seals the paper fibres so that nothing can ever seep through again like a space age polymer, and while it might be much tougher to saturate the same space once dyed with ink, inevitably the inks will overlay and muddy eachother or create new combined colors where they overlap.
Daniel
Edited to get the name right in my response.